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| name = Downtown MRT Line
Template:Lang | color = 79412A | logo = | logo_width = | image = MRT map DT.svg | image_width = 300px | caption = The Downtown Line is tentatively coloured brown, but change to blue. | type = Rapid transit | system = Mass Rapid Transit (Singapore) | status = Opened (Stage 1), Under Construction (Stage 2, 3) | locale = | start = Bukit Panjang (Stage 2) | end = Expo (Stage 3) | stations = 34 | routes = 1 | ridership = | open = | close = | owner = Land Transport Authority | operator = SBS Transit | character = | stock = Bombardier MOVIA C951 | linelength = Template:Km to mi | tracklength = | notrack = | gauge = Template:RailGauge | el = Third rail | speed = | elevation = | map = Template:MRT route | map_state = collapsed

The Circle Line (CCL) is Singapore's fourth Mass Rapid Transit line, operated by SMRT Corporation. When fully open in 2011, this fully underground line will be Template:Convert long with 31 stations and will become the world's longest fully automated metro line.[1] The Circle Line is coloured orange in the rail map.

As the name implies, the line is an orbital line linking all radial lines leading to the city, and also covering many parts of the Central Area. It will also include a branch line beginning at Promenade Station and ending at Marina Bay Station. Transfers to the North South Line will be provided at Bishan, Dhoby Ghaut and Marina Bay stations, East West Line at Paya Lebar and Buona Vista stations, and North East Line at Dhoby Ghaut, Serangoon and HarbourFront stations. The future Downtown Line will interchange with the Circle Line at Bayfront, Promenade, Botanic Gardens and MacPherson stations.

The Circle Line is the first medium capacity line in Singapore. As a medium capacity line, each Circle Line train has only three cars instead of the six-car configuration as seen on current MRT lines. The rolling stock consists of forty Alstom Metropolis C830 trains. When complete, half a million people are expected to use the Circle Line each day. The completed line will reduce travelling time for commuters by allowing them to shorten trips between north to east or north to west and vice versa, bypassing busy interchanges like City Hall and Raffles Place.

Despite the name, the Circle Line is not actually a full circle, as there will be no through service on the section between Harbourfront and Marina Bay or Dhoby Ghaut. Passengers will need to transfer onto the North-East Line instead. A branch passing through the Marina District is being built, and a "Stage 6" that would complete the circle has been mooted but is not officially planned.[2]

Like the North East Line, the Circle Line features the Art in Transit programme. This consists of artwork that is integrated into station designs as well as "Art Seats". Also part of the LTA's Art in Transit programme were open architectural competitions for two Circle Line stations, Stadium, and Bras Basah, both of which were awarded to WOHA Architects.

HistoryEdit

Plans for the Circle Line date back to the 1980s. Then Minister for Communications and Information Dr Yeo Ning Hong stated that such a system "would be feasible when the population reaches four million".

In the 1990s, the Circle Line was first known as the Marina Line. The Marina Line was initially planned as a 12-station underground line, starting from Chinatown and Dhoby Ghaut via the National Stadium to either Kallang or Paya Lebar station. However, the Chinatown leg was later truncated and was reduced to 6 stations up to Stadium station. On the other hand, a further extension towards Upper Paya Lebar was added. Eventually, the Marina line ended up as an inner circular line. Circle Line stations that were a part of the original Marina Line plans include Dhoby Ghaut, Bras Basah, Esplanade, Promenade, Nicoll Highway and Stadium. Also, the part of the Marina Line from Chinatown Station to Promenade Station is now part of the Downtown Line.

Originally scheduled to be opened from 2006 and fully opened in 2010, with an estimated cost of S$6.7 billion, the Nicoll Highway collapse caused the construction of the line to be delayed. As a result, the opening of the Circle Line was delayed to 2009, and the entire line is now expected to be fully operational by 2011 (excluding the Marina Bay Extension), at an estimated cost of nearly S$10 billion.[3] Due to the re-alignment of the Nicoll Highway station to a new location, the station will be two thirds the size of the original plan before the collapse, and located Template:Convert away from the highway collapse site.[4]

On 27 April 2007, the LTA announced a new branch line from Promenade to Bayfront station[5], with a further extension of the line from Bayfront Station to Marina Bay Station announced one year later. The extension is to be completed by 2012. The decision was also made to open both Caldecott, and Haw Par Villa stations (previously Thomson and West Coast), initially planned as shell stations, together with the whole line, leaving only Bukit Brown Station remained closed when the line opens.

Stage 3, a Template:Convert five-station segment stretching from Bartley to Marymount, was the first section of the line opened on 28 May 2009. Ridership on this section has been considerably lower than estimated, at 32,000 passengers per day (ppd) instead of the expected 55,000 ppd.[6] Tunneling works for the entire line were completed on August 17, 2009[7], and stages 1 and 2 started operations on 17 April 2010[8]

The Circle Line is widely expected to have a Stage 6 which completes the circle from HarbourFront to Promenade stations. Several options have been mooted for closing the Template:Convert gap, primarily a northern route through the existing Tanjong Pagar MRT Station or a southern route passing through the Port of Singapore's Tanjong Pagar dock area, whose lease expires in 2027. The cost of closing the gap has been estimated at S$1.5 to 2.0 billion at 2010 prices.[2]

  • 28 May 2009: Stage 3 (Bartley-Marymount) opened
  • 17 April 2010: Stage 1 & 2 (Dhoby Ghaut-Bartley) opened

AccidentsEdit

Several accidents occurred during the construction of the Circle Line, most notably the Nicoll Highway collapse on 20 April 2004.

Nicoll Highway collapseEdit

Main article: Nicoll Highway collapse

On April 20, 2004, a section of tunnel being built for the Circle Line collapsed, apparently when a retaining wall used in the tunnel's construction gave way. This occurred near what was to become the Nicoll Highway station on the Circle line, not far from the Merdeka Bridge. The accident left a collapse zone Template:Convert wide, Template:Convert long, and Template:Convert deep. Four workers were killed, with three more injured.

A criminal inquiry found the main contractor Nishimatsu Construction Company and joint venture partner firm Lum Chang Construction Company and their officers, as well as key Land Transport Authority officers responsible for the collapse. Several other officers and subcontractors were reprimanded and issued warnings in connection with the accident.

As a result of this accident, the first phase of the Circle Line, previously scheduled to open in 2008, was completed in 2010 instead. The affected station has been shifted about Template:Convert away from the accident site and is now located at Republic Avenue.

This accident had also resulted in stricter safety regulations for the construction of all future MRT lines. The shifting of the Nicoll Highway station also meant it can no longer serve as a terminus for the Bukit Timah Line, partially influencing the creation of the current Downtown Line.

Other incidentsEdit

On August 16, 2007, the Building and Construction Authority (BCA) issued a stop-work order and revoked the contractor's tunnelling permit after a Template:Convert stretch of two lanes sank about Template:Convert, close to the junction of Telok Blangah Road and Alexandra Road in the evening, resulting in a halting of tunnelling works.[9]

A section of the road above a construction site near Holland Road caved in on the morning of May 24, 2008, creating a massive hole. The hole, directly in front of two private houses along Cornwall Gardens Road, measured 8 by 7 metres and was 3 metres deep. No one was injured, but the road was temporarily closed to traffic.[10]

StationsEdit

File:Bishan MRT Circle Line Underground Platform 2007.JPG
File:BartleyMRTStation-Singapore-20071102.jpg
Main article: List of Circle MRT Line station names
Station Number Station Name Interchange
Stages 1, 2 & 3
CC1 / NS24 / NE6Dhoby GhautNorth South Line, North East Line
CC2Bras Basah 
CC3Esplanade 
CC4 / DT15PromenadeDowntown Line and Marina Bay Extension
CC5Nicoll Highway 
CC6Stadium 
CC7Mountbatten 
CC8Dakota 
CC9 / EW8Paya LebarEast West Line
CC10 / DT26MacPhersonDowntown Line
CC11Tai Seng 
CC12Bartley 
CC13 / NE12SerangoonNorth East Line
CC14Lorong Chuan 
CC15 / NS17BishanNorth South Line
CC16Marymount 
Stages 4 & 5
CC17Caldecott
CC18Bukit BrownProvisional name
CC19 / DT9Botanic GardensDowntown Line
CC20Farrer Road 
CC21Holland Village 
CC22 / EW21Buona VistaEast West Line
CC23one-north 
CC24Kent Ridge 
CC25Haw Par Villa 
CC26Pasir Panjang 
CC27Labrador Park 
CC28Telok Blangah 
CC29 / NE1HarbourFrontNorth East Line

Marina Bay ExtensionEdit

Station Number Station Name Interchange
CC4 / DT15PromenadeCircle Line, Downtown Line
CE1 / DT16BayfrontDowntown Line
CE2 / NS27Marina BayNorth South Line

Rolling stockEdit

File:C830Interior.JPG
File:C830door.JPG
File:C830front.JPG

The rolling stock consists of Alstom Metropolis C830 and Alstom Metropolis C830C trains[11] running in three-car formation. They are stabled at Kim Chuan depot, the world's largest underground depot.[12]

ReferencesEdit

External linksEdit

Template:Commons category

Template:Mass Rapid Transit (Singapore) Template:Singapore railway lines Template:Singapore MRT stations Template:Future developments in Singaporede:Ringlinie (Singapur) id:Jalur Lingkar (MRT Singapura) nl:Circle Line (Singapore) ja:MRT環状線 no:Circle-linjen (Singapore) simple:Circle MRT Line zh:新加坡地铁环线

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